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you have no reset button per-se. To reset the unit, unplug from AC outlet for one minute, then plug back in. If you still have some issue with it, it is important to give some clues. Are you getting error code lamps blinking. Any response from unit at all.
To read error code the lamp or lamps (LED on front of unit) may blink momentarily, then another series of blinks. you must count the blink series.

may blink once, pause then blink twice, then repeat that series. that would be a code of 12, which is no error found.

may blink 5 times, pause then blink 7 times, then repeat that series, that would be a 57 error code, meaning ballast communication problem.

There are several other error code possibilities, so it is important to be able to convey any error code in order to be most helpful.

Laptop LED Blink on Startup
There are many reasons that a computer does not startup or boot into the Windows operating system. If your computer will not start or boot, you will see or hear symptom to indicate the general area of the problem.Startup Symptom: LEDs blink but does not start
The blinking LED lights on newer computers, or the beep tones on older computers, will help support agent determine what hardware component is not responding properly. The exact meaning of each code varies with the model, and the user cannot change any of the blink or beep codes. DO THESE FIRST - Perform a hard reset.
If a PC suddenly fails to boot properly, you should perform a hard reset as the first procedure.
1.Disconnect all peripheral devices and remove all USB devices and media cards. You want to test the computer not the accessories!
2.Disconnect the AC power adapter, remove the battery and then press and hold the power button for at least 15 seconds.
3.Reconnect the AC power adapter (but do not connect the battery), Press the Power button, Look for glowing LEDs near caps lock and num lock keys, and Listen for sounds of a disk drive and fan turning.Identify the number of blinks or beeps
When there is a start-up problem and you see LED lights on the keyboard blink a few times (between 1 and 8 blinks) do the following actions. Table of Sample Blink Codes
The following table illustrates the meaning of blink codes used on some notebooks. The blink or beep codes on your computer may have different meanings.Meaning of Sample Blink Codes for some EFI Notebooks:
1)Number of Blink: Continuous Glow,Blinking LED: Battery power LED,Component: Battery,
Error Condition: The AC adapter is attached and the battery is charging, but does not yet have sufficient charge to power the notebook.
2)Number of Blink: 1,Blinking LED: Caps Lock/Num Lock,Component: CPU,
Error Condition: CPU not functional
3)Number of Blink: 2,Blinking LED: Caps Lock/Num Lock,Component: BIOS,
Error Condition: BIOS corruption failure
4)Number of Blink: 3,Blinking LED: Caps Lock/Num Lock,Component: Memory,
Error Condition: Module error not functional
5)Number of Blink: 4,Blinking LED: Caps Lock/Num Lock,Component: Graphics,
Error Condition: Graphics controller not functional.
6)Number of Blink: 5,Blinking LED: Caps Lock/Num Lock,Component: system board,
Error Condition: General system board failure.
7)Number of Blink: 6,Blinking LED: Caps Lock/Num Lock,Component: BIOS,
Error Condition: BIOS authentication failure.
8)Number of Blink: Continuous blink,Blinking LED: AC power adapter LED,Component: Power adapter,
Error Condition: Insufficient powerCommon solutions for issues that cause blinking LEDs or beep tones
When the computer can boot into the BIOS, run the memory test to identify other issues. Check for loose connections and test the memory
Blink codes are often displayed after a user adds memory to the computer but does not seat the module properly. The LEDs may also blink error codes if a hardware component is loose because the computer was dropped or jarred. The problem could be that the stick of memory or one of the memory slots has a bad connection. Check for loose memory modules
If a memory module is loose or is not making good contact with the memory slots, the computer does not recognize all of the memory. Reseating the memory module may resolve memory failure errors.

Most of the Mitsubishi rear projection sets made from about 2000 through 2006 have a self diagnostic check feature. It will indicate if there is a error or not and point you in the direction of your trouble.

Based on the error code I or others can tell you more based on the error code and the EXACT model number of the set.

Here is what you do if it turns on for a few seconds and then the power light goes off.

in this model error 5( 5 blinks then 5 blinks) is indicating AKB, TOO LOW or ABSENT beam current. Meaning the tube has gone bad. You will need to replace the tube. I am sorry for the bad news. hope that doesnt hurt my rating.